In the most recent beta version (16.0.0 beta 1) filter entries containing TABs don’t work to export and then reimport again. It doesn’t corrupt the filter export file line format now like before, but the TAB:s are instead double escaped when reimported now, and thus don’t work.
That is, if you export a filter like this:
\tABCD\t
it becomes the following after you re-import it:
\\tABCD\\t
and thus won’t work anymore.
(if it matters, I used the new macro functionality for exporting/importing it)